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Equity Roll Forward
 3 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Equity
The change in equity for the first three months of 2016 is shown below (in millions):  
 
Common
Stockholders'
Equity
 
Noncontrolling Interests in Subsidiaries
 
Total Equity
Balance at September 30, 2015
$
8,081

 
47

 
8,128

Net earnings
349

 
3

 
352

Other comprehensive income (loss)
(121
)
 
—

 
(121
)
Cash dividends
(310
)
 
(9
)
 
(319
)
Net purchases of common stock
(543
)
 
—

 
(543
)
Balance at December 31, 2015
$
7,456

 
41

 
7,497